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From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: "Christoph Lameter" <cl@linux.com>,
	"Pekka Enberg" <penberg@kernel.org>,
	"David Rientjes" <rientjes@google.com>,
	"Joonsoo Kim" <iamjoonsoo.kim@lge.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Vlastimil Babka" <vbabka@suse.cz>,
	"Roman Gushchin" <roman.gushchin@linux.dev>,
	"HORIGUCHI NAOYA(堀口 直也)" <naoya.horiguchi@nec.com>,
	"Joe Perches" <joe@perches.com>, "Petr Mladek" <pmladek@suse.com>,
	"Matthew WilCox" <willy@infradead.org>,
	"David Hildenbrand" <david@redhat.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC v3 3/4] mm, printk: introduce new format %pGt for page_type
Date: Mon, 19 Dec 2022 11:44:16 +0200	[thread overview]
Message-ID: <Y6AycLbpjVzXM5I9@smile.fi.intel.com> (raw)
In-Reply-To: <20221218101901.373450-4-42.hyeyoo@gmail.com>

On Sun, Dec 18, 2022 at 07:19:00PM +0900, Hyeonggon Yoo wrote:
> %pGp format is used to print 'flags' field of struct page.
> As some page flags (e.g. PG_buddy, see page-flags.h for more details)
> are set in page_type field, introduce %pGt format which provides
> human readable output of page_type.
> 
> Note that the sense of bits are different in page_type. if page_type is
> 0xffffffff, no flags are set. if PG_slab (0x00100000) flag is set,
> page_type is 0xffefffff. Clearing a bit means we set the bit.
> 
> Bits in page_type are inverted when printing page type names.

...

> +#define __def_pagetype_names						\
> +	{PG_slab,			"slab"		},		\
> +	{PG_offline,			"offline"	},		\
> +	{PG_guard,			"guard"		},		\
> +	{PG_table,			"table"		},		\
> +	{PG_buddy,			"buddy"		}

Wondering if it will be more robust to define a helper macro

#define DEF_PAGETYPE_NAME(_name)	{ PG_##_name, __stringify(_name) }
...
#undef DEF_PAGETYPE_MASK

In this case it decreases the chances of typo in the strings and flags.

-- 
With Best Regards,
Andy Shevchenko



  reply	other threads:[~2022-12-19  9:44 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-18 10:18 [RFC v3 0/4] move PG_slab flag to page_type Hyeonggon Yoo
2022-12-18 10:18 ` [RFC v3 1/4] mm/hwpoison: remove MF_MSG_SLAB from action_page_types Hyeonggon Yoo
2022-12-20 23:53   ` HORIGUCHI NAOYA(堀口 直也)
2022-12-21 17:00     ` Andy Shevchenko
2022-12-29 13:18       ` Hyeonggon Yoo
2022-12-29 13:17     ` Hyeonggon Yoo
2022-12-18 10:18 ` [RFC v3 2/4] mm: move PG_slab flag to page_type Hyeonggon Yoo
2023-01-12 16:27   ` Vlastimil Babka
2023-01-30  4:34     ` Hyeonggon Yoo
2023-01-30  5:11       ` Matthew Wilcox
2023-02-03 16:00         ` Hyeonggon Yoo
2023-02-03 16:19           ` Matthew Wilcox
2023-02-08 13:56             ` Hyeonggon Yoo
2023-02-03 16:04         ` David Hildenbrand
2023-02-08  9:44           ` Mike Rapoport
2023-02-08 10:13             ` David Hildenbrand
2022-12-18 10:19 ` [RFC v3 3/4] mm, printk: introduce new format %pGt for page_type Hyeonggon Yoo
2022-12-19  9:44   ` Andy Shevchenko [this message]
2022-12-19 19:35     ` Randy Dunlap
2022-12-20 10:58       ` Andy Shevchenko
2022-12-29 13:35         ` Hyeonggon Yoo
2022-12-20 15:20   ` Petr Mladek
2022-12-29 13:30     ` Hyeonggon Yoo
2022-12-18 10:19 ` [RFC v3 4/4] mm/debug: use %pGt to print page_type in dump_page() Hyeonggon Yoo

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